The chalcone butein from Rhus verniciflua Stokes inhibits clonogenic growth of human breast cancer cells co-cultured with fibroblasts

Table 1 Clonogenic growth of primary breast cancer cells co-cultured with fibroblasts pre-treated with butein (2.5 μg/mL).

Clinical Sample #	Mean number of colonies with butein pre-treatment (1 s.d.)	Mean number of colonies without butein pre-treatment (1 s.d.)
1	0 (0)	13 (4)*
2	0 (0)	36 (9)*
3	0 (0)	6 (4) *
4	3 (2)	12 (5)*
5	7 (4)	29 (8)*

*p value < 0.02 by two-tailed, unpaired t-test comparing means and s.d. of butein pre-treatment versus no pre-treatment

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